Long hauler
Junior Member
Okay, so I have 2019 Ram 2500 Cummins 6.7. I’ve been changing oil and using Rotella T6 15w-40. Currently have 110,000 miles and been using this oil for the last 80,000 miles. I’ve noticed my engine having the idle tick and sounding rougher when driving. Did some digging and realized I’ve been using the wrong oil this entire time. I’m changing to recommended but have I already done the damage? Will it help fix the deposits on the valve lash I read about? I’m due for next oil change now and want to make sure.